GHK Cu Peptide Foundry Premium Research Peptides GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule GHK Cu is the buzz word GHK Cu (glycyl L histidyl L lysine copper) is a naturally occurring copper peptide that declines with age, acting as a potent regenerative signaling molecule to boost collagen, elastin, and skin health. It